Finding the Third Proportional to 390,582 and 590,062.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,582 : 590,062.50 = 590,062.50 : x
2. Step 2: Convert to fraction form
   390,582/590,062.50 = 590,062.50/x
3. Step 3: Cross multiply
   390,582x = 590,062.50 × 590,062.50
4. Step 4: Simplify right side
   390,582x = 348,173,753,906.25
5. Step 5: Solve for x
   x = 348,173,753,906.25/390,582
6. Step 6: Final answer
   x = 891,422.94